Job Description:

• 1) Operates gas furnace that heats metal gun parts to rustproof and impart decorative nonreflecting blue finish: Sprays parts with steam to remove grease, grit, and dirt.

• 2) Places parts in barrel of gas furnace and covers parts with mixture of bone chips and whale or pine tar oil.

• 3) Closes furnace door and moves lever to rotate barrel.

• 4) Turns gas valves and observes pyrometer to regulate temperature of furnace.

• 5) Opens door after furnace cools, and pulls lever to tilt barrel and dump contents into sieve.

• 6) Sifts parts from bone mixture and quenches parts in oil.

• 7) Blows oil and chips from blued parts, using airhose.

• 8) Examines parts to ensure shade and color conform to specifications, utilizing knowledge of heat-treating methods and metal properties.